The most argued accent in the country. A lot of people in New Jersey dont have the accent. But a lot of the state do, some thicker than most. Most of the south part of the state don't have an accent and also in North West jersey where the accent isn't as common. The accent is mostly found in the North Eastern region of the state like Bergen, Hudson, Passaic, Essex, and Union counties.
The accent is similar to the NY accent but at times there is a distinct difference that most people cannot tell apart.
No one says Joisey for the record, it is just a myth.. but you can come accross a few that do but very rarely, and there usually on the death bed border.

The areas where you'd find the Strongest accents in Jersey are Jersey City, Newark, Hackensack, and Paterson.

What most people call the dialect spoken in Staten Island, Bayonne and parts of Long Island. The actual Northern NJ accent today is a mellowed version of a New York Accent, which in itself has its origins in the original British accent. (As NY was a Tory region for so long.) NYers tend to drop their R's more than NJers but otherwise pronounce words like coffee and talk as (kawfey) and (tawk) And New York like Nu-yawk.)

With So many hundreds of thousands of people moving to and from the NYC metro area every year, The traditional Jersey Accent has all but disappeared.